BobCat E35 – CYLINDER (BOOM SWING) – Assembly

Clean all parts in solvent and dry with compressed air.

Inspect all parts for wear or damage. Replace any worn or damaged parts.

Always install new seals and O-rings. Lubricate all seals and O-rings with clean hydraulic fluid before installation.

Use the following tools to assemble the cylinder:

MEL1396 – Universal Seal Expander
MEL1033 – Rod Seal Installation Tool
MEL1396-2 – Piston Ring Compressor
MEL1075 – Adjustable Gland Nut Wrench
MEL1075-1 – Standard Pins

Install the new seal on the tool and slowly stretch it until it fits the piston [Figure 20-23-22].

Allow the seal to stretch for 30 seconds before installing it on the piston.

Install the seal (Item 1) [Figure 20-23-23].

Use a ring compressor to compress the seal to the correct size. Leave the piston in the compressor for about three minutes [Figure 20-23-24].

Install the rod seal on the rod seal tool [Figure 20-23-25].

NOTE: During installation the spring side of the seal must be toward the inside of the cylinder.

Rotate the handles to collapse the rod seal [Figure 20-23-25].

Install the rod seal in the head [Figure 20-23-26].

Install the wiper seal with the wiper (Item 1) [Figure 20-23-27] toward the outside of the head.

Install the O-ring (Item 1) [Figure 20-23-28].

Install the seal (Item 2) [Figure 20-23-28].

Install the head (Item 1), spacer (Item 2) and the piston (Item 3) [Figure 20-23-29] on the rod as shown.

NOTE: Clean and dry the rod threads. Install a NEW NUT with pre-applied Loctite®.

Grease the piston where the nut contacts the piston. Do not get grease on the threads.

Provide an adequate support for the cylinder before tightening.

Install the nut (Item 4) [Figure 20-23-29].

Tighten the nut to 1491 N•m (1100 ft-lb) torque.

Install plug (Item 1) and O-ring (Item 2) [Figure 20-23-30].

Tighten the plug to 20 N•m (15 ft-lb) torque.

Put the base end of the hydraulic cylinder in a vise.

Insert the adjustable gland nut wrench into the two holes (Item 1) [Figure 20-23-31] to tighten the head. Head to
be torqued until flush with end of housing.

Install the bushing (Item 1) [Figure 20-23-32]. The bushing must be aligned with the grease channel in the rod end of the cylinder.

Install the dust seal (Item 2) [Figure 20-23-32] on both sides of the rod end.


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